Question

Write a JAVA program to find the square root of a number.

Answer 1

/*Java program to find out square root of a given number * without using any Built-In Functions */public class SquareRootDemo2{     public static void main(String[] args)    {        //Number for which square root is to be found        double number = -12;         //This method finds out the square root        findSquareRoot(number);     }     /*This method finds out the square root without using    any built-in functions and displays it */    public static void findSquareRoot(double number)    {         boolean isPositiveNumber = true;        double g1;         //if the number given is a 0        if(number==0)        {            System.out.println("Square root of "+number+" = "+0);        }         //If the number given is a -ve number        else if(number<0)        {            number=-number;            isPositiveNumber = false;        }         //Proceeding to find out square root of the number        double squareRoot = number/2;        do        {            g1=squareRoot;            squareRoot = (g1 + (number/g1))/2;        }        while((g1-squareRoot)!=0);         //Displays square root in the case of a positive number        if(isPositiveNumber)        {            System.out.println("Square roots of "+number+" are ");            System.out.println("+"+squareRoot);            System.out.println("-"+squareRoot);        }        //Displays square root in the case of a -ve number        else        {            System.out.println("Square roots of -"+number+" are ");            System.out.println("+"+squareRoot+" i");            System.out.println("-"+squareRoot+" i");        }     }}

Answer 2

Answer:

import java.util.Scanner;

public class Roots

{

void compute( )

{

Scanner sc=new Scanner(System.in) ;

int num;

System.out.print("Enter integer number: ");

num=sc.nextInt( );

System.out.println("Square Root of" + num + "is:" + Math.sqrt(num)) ;

}

}

Explanation:

The Math.sqrt methods returns the square root of a number given as its arguments.